<?php

namespace Helper;

class Inflector {

	/**
	 * Underscore
	 *
	 * Takes multiple words separated by spaces and underscores them
	 *
	 * @access	public
	 * @param	string
	 * @return	str
	 */
	public static function underscore($str) {
		return preg_replace('/[\s]+/', '_', strtolower(trim($str)));
	}

	/**
	 * Humanize
	 *
	 * Takes multiple words separated by underscores and changes them to spaces
	 *
	 * @access	public
	 * @param	string
	 * @return	str
	 */
	public static function humanize($str) {
		return ucwords(preg_replace('/[_]+/', ' ', strtolower(trim($str))));
	}

	/**
	 * Camelize
	 *
	 * Takes multiple words separated by spaces or underscores and camelizes them
	 *
	 * @access	public
	 * @param	string
	 * @return	str
	 */
	public static function camelize($str) {
		$str = 'x' . strtolower(trim($str));
		$str = ucwords(preg_replace('/[\s_]+/', ' ', $str));
		return substr(str_replace(' ', '', $str), 1);
	}

	/**
	 * Plural
	 *
	 * Takes a singular word and makes it plural
	 *
	 * @access	public
	 * @param	string
	 * @param	bool
	 * @return	str
	 */
	public static function plural($str, $force = FALSE) {
		$result = strval($str);

		$plural_rules = array(
			'/^(ox)$/' => '\1\2en', // ox
			'/([m|l])ouse$/' => '\1ice', // mouse, louse
			'/(matr|vert|ind)ix|ex$/' => '\1ices', // matrix, vertex, index
			'/(x|ch|ss|sh)$/' => '\1es', // search, switch, fix, box, process, address
			'/([^aeiouy]|qu)y$/' => '\1ies', // query, ability, agency
			'/(hive)$/' => '\1s', // archive, hive
			'/(?:([^f])fe|([lr])f)$/' => '\1\2ves', // half, safe, wife
			'/sis$/' => 'ses', // basis, diagnosis
			'/([ti])um$/' => '\1a', // datum, medium
			'/(p)erson$/' => '\1eople', // person, salesperson
			'/(m)an$/' => '\1en', // man, woman, spokesman
			'/(c)hild$/' => '\1hildren', // child
			'/(buffal|tomat)o$/' => '\1\2oes', // buffalo, tomato
			'/(bu|campu)s$/' => '\1\2ses', // bus, campus
			'/(alias|status|virus)/' => '\1es', // alias
			'/(octop)us$/' => '\1i', // octopus
			'/(ax|cris|test)is$/' => '\1es', // axis, crisis
			'/s$/' => 's', // no change (compatibility)
			'/$/' => 's',
		);

		foreach ($plural_rules as $rule => $replacement) {
			if (preg_match($rule, $result)) {
				$result = preg_replace($rule, $replacement, $result);
				break;
			}
		}

		return $result;
	}

	/**
	 * Singular
	 *
	 * Takes a plural word and makes it singular
	 *
	 * @access	public
	 * @param	string
	 * @return	str
	 */
	public static function singular($str) {
		$result = strval($str);

		$singular_rules = array(
			'/(matr)ices$/' => '\1ix',
			'/(vert|ind)ices$/' => '\1ex',
			'/^(ox)en/' => '\1',
			'/(alias)es$/' => '\1',
			'/([octop|vir])i$/' => '\1us',
			'/(cris|ax|test)es$/' => '\1is',
			'/(shoe)s$/' => '\1',
			'/(o)es$/' => '\1',
			'/(bus|campus)es$/' => '\1',
			'/([m|l])ice$/' => '\1ouse',
			'/(x|ch|ss|sh)es$/' => '\1',
			'/(m)ovies$/' => '\1\2ovie',
			'/(s)eries$/' => '\1\2eries',
			'/([^aeiouy]|qu)ies$/' => '\1y',
			'/([lr])ves$/' => '\1f',
			'/(tive)s$/' => '\1',
			'/(hive)s$/' => '\1',
			'/([^f])ves$/' => '\1fe',
			'/(^analy)ses$/' => '\1sis',
			'/((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/' => '\1\2sis',
			'/([ti])a$/' => '\1um',
			'/(p)eople$/' => '\1\2erson',
			'/(m)en$/' => '\1an',
			'/(s)tatuses$/' => '\1\2tatus',
			'/(c)hildren$/' => '\1\2hild',
			'/(n)ews$/' => '\1\2ews',
			'/([^u])s$/' => '\1',
		);

		foreach ($singular_rules as $rule => $replacement) {
			if (preg_match($rule, $result)) {
				$result = preg_replace($rule, $replacement, $result);
				break;
			}
		}

		return $result;
	}

}
